There is ongoing debate about the methods that evaluators should use to assess the adaptive functioning of an individual in an Atkins claim, including the appropriateness of using self-report measures and extent to which adaptive functioning measures are valid for persons with a history of violent offending. This study examined whether offenders' self-report adaptive functioning scores tended to decrease as their level of psychopathic traits increased. Eighty-five male felony probationers completed the self-report version of the Adaptive Behavior Assessment System - II (ABAS-II: Harrison & Oakland, 2003), the Psychopathic Personality Inventory - Revised (PPI-R: Lilienfeld & Widows, 2005), and a brief intelligence screening measure. ABAS-II composite scores were negatively correlated with PPI-R Self-Centered Impulsivity and Coldheartedness scores, but positively correlated with Fearless Dominance scores. These relationships appeared to be due, in part, to over-reporting symptoms of impairment across measures, suggesting that scores on self-report adaptive functioning measures may be especially susceptible to feigning.

Although several experts have raised concerns about using correctional officers as informants for adaptive behavior assessments, no studies have compared ratings from correctional officers to those from other informants. We compared Adaptive Behavior Assessment System-Second Edition (ABAS-II; Harrison & Oakland, 2003) scores assigned by correctional staff to those assigned by probationers (N = 56) residing in a community corrections facility. Correctional staff assigned markedly lower scores than did probationers on many ABAS-II scales (d = .59 to 1.41 for ABAS-II composite scores). Although none of the probationers qualified for a diagnosis of intellectual disability, 29% received a staff-report ABAS-II composite score that was more than 2 SDs below the normative sample mean, suggesting significant impairment. Correlations between ABAS-II and intelligence measure scores were lower than expected for both types of informants, although they were somewhat stronger for self-report. Lower staff-report scores were associated with higher levels of probationer-reported psychopathology and need for treatment. Overall, these findings highlight limitations of using correctional staff as informants for adaptive behavior assessments. (PsycINFO Database Record